GPT-4.1 vs o3 Pro

Compare GPT-4.1 and o3 Pro: pricing, performance, context window, latency, and best use cases. Side-by-side comparison on XALEN.

Updated 2026-05-21 · By Abhishek Raj · Our methodology

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Feature GPT-4.1 o3 Pro
CategoryFrontierReasoning
Parameters~1.8T~1T
Context Window1M200K
Input Price$0.10/1M tokens$0.15/1M tokens
Output Price$0.30/1M tokens$0.60/1M tokens
Latency~500ms~5000ms

Choose GPT-4.1 when:

  • ✓ Complex reports
  • ✓ Code generation
  • ✓ Enterprise workflows
Key Strengths:

1M context, Best instruction following, Best coding

Choose o3 Pro when:

  • ✓ Research-grade reasoning
  • ✓ Mathematical proofs
  • ✓ Hardest problems
Key Strengths:

Deepest reasoning, Best for hard problems, Highest accuracy

Verdict: GPT-4.1 vs o3 Pro

For cost efficiency, GPT-4.1 wins at $0.10/1M input tokens. For speed, o3 Pro is faster at ~5000ms. GPT-4.1 excels at Complex reports while o3 Pro is better for Research-grade reasoning. Both are available on XALEN through a single API — try them in the Playground to see which fits your workload.

Detailed Analysis

Pricing Comparison

GPT-4.1 costs $0.10/1M input tokens and $0.30/1M output tokens. o3 Pro costs $0.15 input and $0.60 output. GPT-4.1 is 1.5x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.

Performance & Context

GPT-4.1 has a 1M context window with ~500ms latency. o3 Pro offers 200K context at ~5000ms. GPT-4.1 has the larger context window.

Best For

GPT-4.1 (Frontier) is optimized for: Complex reports, Code generation, Enterprise workflows. o3 Pro (Reasoning) works best for: Research-grade reasoning, Mathematical proofs, Hardest problems.

Try Both on XALEN

Both models are available through XALEN's OpenAI-compatible API. Switch between them by changing the model parameter:

from xalen import XALEN

client = XALEN(api_key="xln_test_YOUR_KEY")

# Use GPT-4.1
response_a = client.chat.completions.create(
    model="gpt-4-1",
    messages=[{"role": "user", "content": "Your question here"}]
)

# Use o3 Pro
response_b = client.chat.completions.create(
    model="o3-pro",
    messages=[{"role": "user", "content": "Your question here"}]
)

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Frequently Asked Questions

Which is better, GPT-4.1 or o3 Pro?

GPT-4.1 (Frontier, ~1.8T) offers 1M context. o3 Pro (Reasoning, ~1T) offers Deepest reasoning. Choose GPT-4.1 for Complex reports or o3 Pro for Research-grade reasoning.

How much does GPT-4.1 cost vs o3 Pro?

GPT-4.1: $0.10/1M input, $0.30/1M output. o3 Pro: $0.15/1M input, $0.60/1M output. Both available on XALEN with batch processing at 50% discount.

Can I use both models on XALEN?

Yes. XALEN provides 200+ models through a single OpenAI-compatible API. Switch between GPT-4.1 and o3 Pro by changing the model parameter. No code changes needed.

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Last updated: 2026-05-21. Pricing and specifications may change. Check pricing page for latest rates.